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How is spot size of a laser measured?

  1. Centimeters

  2. Millimeters

  3. Nanometers

  4. Inches

The correct answer is: Millimeters

The spot size of a laser is generally measured in millimeters because it is a more precise unit of measurement in terms of the size of the focused laser beam. Centimeters and inches are larger units of measurement, while nanometers are smaller units and may not accurately reflect the actual size of the spot. Therefore, B is the most appropriate answer. Additionally, using centimeters or inches could result in significant rounding errors, while nanometers may be too small to accurately measure.